feat: Update local agent documentation to reflect changes in user_id and session_id handling; add marketing strategy document; update skills-lock.json with new Remotion best practices; update website subproject commit.

docs/local_agent_v2_mem.md

@@ -220,13 +220,22 @@ if lf:
 
 **Pattern V3 corretto nel codice produzione (`agent_runner.py`, `deep_agent.py`, `agent_setup.py`):**
 ```python
-# user_id e session_id vanno in metadata, NON come kwarg diretti
-lf.start_as_current_observation(
+# user_id e session_id propagati come attributi first-class Langfuse
+# tramite langfuse_context() che wrappa propagate_attributes()
+from app.core.langfuse_client import langfuse_context
+
+_lf_ctx = langfuse_context(user_id=user_id, session_id=session_id)
+_lf_ctx.__enter__()
+
+# user_id viene hashato con SHA-256 prima dell'invio a Langfuse
+# session_id arriva dal renderer (home/floating) o dal run_id (batch)
+
+_span_ctx = lf.start_as_current_observation(
     as_type="span",
     name="my-span",
-    metadata={"user_id": user_id, "session_id": session_id},
     input=...,
 )
+# NON mettere user_id/session_id in metadata — propagate_attributes li gestisce
 ```
 
 ### compile_prompt — non usare template.format() direttamente